PRWeb has a press release/article from Niagara Falls Tourism:
Stories vary as to how Niagara Falls became “Honeymoon Capital of the World.” Some attribute it to Aaron Burr’s daughter, Theodosia, who chose a Niagara Falls honeymoon in 1801. Others say it was Napoleon Bonaparte’s brother–Jerome–who sparked the tradition in 1804. Nevertheless, today over 50,000 honeymooners choose a Niagara Falls getaway each year, and the Canadian destination maintains its popularity.